Bark-peeling tool mounted on pneumatic hammer and reciprocated thereby



Aprll 12, 1955 FONTS 2,705,982

BARK-FEELING TOOL MOUNTED ON PNEUMATIC HAMMER AND RECIPROCATED THEREBY Filed May 3, 1954 INVEN TOR Jose oh f7 1 0/779 United States Patent BARK-PEELING TOOL MOUNTED ON PNEU- MATIC HAMMER AND RECIPROCATED THEREBY My present invention relates to bark-peeling equipment and more particularly to a bark-peeling tool operated by a pneumatic hammer.

The present invention is mainly concerned with the tool end of the hammer since the internal construction of the hammer is well known in principle. The pneumatic hammer shown in the drawings is a modified riveter type on which the improved tool is mounted. Other types of pneumatic hammers such as jack hammers may be adapted to receive the bark-removing tool.

The principal object of the invention is to produce an improved bark-peeling tool.

Another object is to produce an improved portable pneumatically operated bark-peeling tool that forces the operating tool between the bark and the wood portion of a log, the bark sliding over the penetrating end of the tool and being then forced upwardly and away from the log in successive operations of the tool, and other objects of the invention will be more apparent as the description of the construction and the operation of the same progresses.

In the drawings illustrating the invention:

Fig. 1 is a side elevation of the device, portions of which are shown in dotted lines other portions being broken off for convenience;

Fig. 2 is a top plan view, portions of which are broken on four convenience;

Fig. 3 is a fragmentary side elevation showing the tool in one of the positions it assumes while removing bark from a log;

Fig. 4 is a fragmentary longitudinal-section of the operating end of the tool and is taken on the line 4-4 of Fig. 2, and

Fig. 5 is a fragmentary cross-section taken on line 55 of Fig. 1

Referring more in detail to the drawings, is a pneumatic hammer and 11 is an improved bark-peeling tool generally indicated.

A penetrating portion 12 of the tool is chisel-shaped and has a shank portion 13 which fits in a ram end 23 of the hammer 10.

In the hammer 10 shown there are provided side springs 15 and 16 on rods 17 and 18. The rods 17 and 18 are threaded into brackets 19 and 20 on the tool head 11 and are loosely slidable through brackets 21 and 22 located on a ram cylinder 14 of the hammer 10. These springs maintain the shank portion 13 in the ram end 23 and retract the chisel portion 12 when the ram end 23 moves backwardly and also causes the ram to move the chisel portion 12 forward with more of a push than a sharp blow. When in operation the chisel portion 12 is driven ahead between the wood 54 and the bark 45, the hammer 10 being manually shoved forward as the chisel portion progresses.

After the chisel portion 12 has been driven in under the bark 45 the hammer 10 is temperaturely de-energized. At this point the bark 45 is raised as shown in Fig. 3 by means of a bark-lifting lever 30 pivoted at 31 in the chisel portion 12 and having downwardly and rearwardly directed teeth on its lower surface that dig into the wood of the log and prevent the chisel portion 12 from moving rearwardly owing to any action by the pneumatic hammer 10. The toothed lever 30 is pivoted clockwise (as viewed in Figs. 1, 3 and 4) on the chisel portion 12 by a second ram member 35 the rear end of which is provided with a piston 36 located in a cylinder 37 which is pivoted at 38 on the pneumatic hammer 2,705,982 Patented Apr. 12, 1955 10. A compressed air line 39 having a valve 40 communicates with the cylinder 37 and permits compressed air to be applied against the piston 36 to force the ram 35 outwardly. When the valve 40 is shut oil and vented, a coil compression spring 41 located between the piston 36 and a forward end of the cylinder 37, retracts the ram, as shown in Fig. 1. A forward head 46 of the ram 35 is slotted and is provided with three coaxial rollers 47, 47 and 48 mounted on a pin 53 extending transversely through the slotted head, each of the rollers 47 being located on an outside face of the head, and the roller 48 being located in a lower portion of the slot in the head 46, so that all rollers make contact with the top surface of the chisel portion 12. A rear portion 49 of lever 30 is provided on each side with longitudinal grooves or roll ways 50 within which operate rollers 51 journalled on bearings located in an upper portion of the slot in the head 46, said bearings constituting inner ends of bolts 2% which are threaded into each side of the slotted head It will thus be seen that when the chisel portion 12 is forced between the bark 45 and the log 54 and compressed air is admitted to the cylinder 37, the teeth on the lever 30 prevent the tool from backing away from the log 54 when the ram head 46 is pushed forward and rolls on the top face of said chisel member. This action pivots the rear portion 49 of the lever 30 upwardly and forwardly on the pin 31 in the chisel portion 12, as shown in Fig. 3, thus forcing the bark 45 upwardly and away from the log 54. This operation is repeated from time to time until the bark has been removed from the log 54. During movement of the ram 35 in and out of glge cylinder 37 the cylinder slightly rocks on the pivot No special type of pneumatic hammer is necessary or claimed. Such hammers may dilfer in detail, since the riveter type shown may be "replaced, for example, by the so-called jack hammer on which the springs 15 would not be necessary. I wish to bring out that any pneumatic type of hammer may be used in which there is a ram member engaging the rear end of my special tool and to which may be attached the second ram cylinder 37.

While I have shown my invention somewhat in detail, yet it is to be understood that I may change the proportions and use equivalent structure coming within the scope of the appended claims.

Having thus described my invention what I claim as new 1s:

1. An improved bark-removing tool for use in combination with a pneumatic hammer, comprising a chiselshaped member for penetrating between the wood portion and the bark of a log, said chisel member being mounted on and reciprocated by said hammer to effect said penetration, a toothed member mounted for pivotal movement about a transverse axis through said chisel member and having a rear portion extending above the top face of said chisel member, a compressed air cylinder pivoted on said hammer and having an internal piston returnable by means of an internal compression spring, said piston having an externally extended ram portion, a head on the outer end of said ram, rollers located on said head and contacting the upper face of said chisel member, said head being movably engaged with the rear portion of said toothed member and pivoting said rear portion upwardly when said ram advances from said cylinder, the rear portion of said toothed member engaging the under side of said bark and raising the bark up and away from said wood portion.

2. An improved bark-removing tool for use in combination with a pneumatic hammer as set forth in claim 1, in which the movable engagement between said head and said rear portion of the toothed member comprise internal rolls located on said head and engaging in rollways located in the sides of said rear portion.

3. An improved bark-removing tool for use in combination with a pneumatic hammer, said tool having a. head portion mounted on and reciprocated by said hammer, a pneumatic cylinder pivoted on said hammer and having a reciprocable ram member extending outwardly in the direction of said head portion, said head portion being of chisel shape so as to penetrate between the bark and wood portion of a log when reciprocated by said hammer, a bark-raising member pivoted in said head portion, and means located on the end of said ram member, said means engaging said bark-raising member and pivoting said bark-raising member upwardly and away from said head portion upon an appropriate stroke of said ram member.

4. An improved bark-removing tool for use in combination with a pneumatic hammer as set forth in claim 3, in which said bark-raising member is provided with a lower curved and toothed claw portion on its forward end that swings down to engage said wood portion of said log when said bark-raising member is pivoted upwardly by means of said ram member.

References Cited in the file of this patent UNITED STATES PATENTS 2,661,782 Burton Dec. 8, 1953 2,672,899 Kafka Mar. 23, 1954 FOREIGN PATENTS 541,950 Germany Jan. 16, 1932 570,310 Germany Feb. 14, 1933 

